Piklist settings page on WP 3.5.2

gistfile1.php

( ! ) Notice: Undefined index: tab in C:\html\master\personal\ssgnewwp\wp-content\plugins\piklist\parts\shared\admin-page.php on line 32 Call Stack #TimeMemoryFunctionLocation 10.0012795336{main}( )..\admin.php:0 20.384034265184do_action( )..\admin.php:151 30.384034266904call_user_func_array ( )..\plugin.php:406 40.384034266936PikList_Admin::admin_page( )..\plugin.php:406 50.384134268936PikList::render( )..\class-piklist-admin.php:232 60.386034310776include( 'C:\html\master\personal\ssgnewwp\wp-content\plugins\piklist\parts\shared\admin-page.php' )..\class-piklist.php:140 Variables in local scope (#6)

$icon =

string 'piklist-page' (length=12)

$page_section =

Undefined

$page_sections =

boolean false

$save =

boolean true

$setting =

string 'piklist' (length=7)

$single_line =

boolean false

$tab =

array (size=2)
  'title' => string 'Add-ons' (length=7)
  'page' => string 'add-ons' (length=7)

$tabs =

array (size=2)
  'default' => 
    array (size=2)
      'title' => string 'General' (length=7)
      'page' => null
  'add-ons' => 
    array (size=2)
      'title' => string 'Add-ons' (length=7)
      'page' => string 'add-ons' (length=7)

$title =

string 'Piklist Settings' (length=16)

$url =

array (size=2)
  'page' => string 'piklist-settings' (length=16)
  'tab' => string 'add-ons' (length=7)

$url_defaults =

array (size=1)
  'page' => string 'piklist-settings' (length=16)

" href="?page=piklist-settings&tab=add-ons"> Add-ons